Elsa and Anna's parents, the king and queen leave Arendelle to welcome the grand return of Rapunzel in Corona. But on their way their ship crashed and sank down the sea, leaving Arendelle to believe they are dead. Sooner or later, Elsa feels that her and Anna's parents are still alive. This mystery ties under the sea in the kingdom of Atlantica. It is there that Elsa, Anna, and their friend Rapunzel meet the little mermaid, Ariel.
